Chemistry

Question 1

matter

Answer 1

anything that occupies space and has mass

Question 2

what three physical states can matter exist in?

Answer 2

solid
liquid
gas

Question 3

elements

Answer 3

unique substances that cannot be broken down into simpler substances by ordinary means

Question 4

what are some characteristics of elements?

Answer 4

1) all matter is composed of elements
2) carbon, oxygen, hydrogen, and nitrogen are elements that make up 96% of body weight
3) 118 elements in the periodic table

Question 5

atoms

Answer 5

the building blocks of elements; tiny particles that cannot be subdivided into smaller substances w/o losing their properties

Question 6

describe the atomic structure

Answer 6

protons
neutrons
electrons

Question 7

neutrons

Answer 7

uncharged or neutral subatomic particles located within the nucleus of the atom

Question 8

protons

Answer 8

positively charged subatomic particles located within the nucleus of the atom

Question 9

electrons

Answer 9

negatively charged subatomic particles that surround the nucleus of an atom

Question 10

molecule

Answer 10

two or more atoms of the same element held together by chemical bonds

Question 11

compound

Answer 11

two or more different kinds of atoms bind together

Question 12

pH

Answer 12

acidity or alkalinity of a solution

Question 13

what is the pH scale when it is 7

Answer 13

neutral

Question 14

what is the pH scale when it is 0-7

Answer 14

acidic

Question 15

what is the pH scale when it is 7-14

Answer 15

basic

Question 16

describe the logarithmic pH scale

Answer 16

pH change from 5 to 4 is 10 times more acidic, 5 to 3 would be 100 times more acidic, 11 to 10 is 10 times more basic

Question 17

how is chemistry applied in Public Health

Answer 17

food safety and sanitation
occupational health